Alternating-current-distributing system.



G. BERRY. ALTEBNATING CURRENT DISTRIBUTING SYSTEM.

APPLICATION TILED OCT. 17, 1908. 1,101,051 Patented June 23,191 L 1 I y earge Berry. a mi/w. ZW any.

COLUIABIA Puwoannm coqwnsmuc'roN. D. c.

V UNITED STATES PA TENT OFFICE.

GEORGE BERRY, OF COLNE MEAD, WEST DRAYTON, ENGLAND, ASSIGNOR T GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK ALTERNATING-CURRENT-DISTRIBUTING SYSTEM.

Application filed October 17, 1908.

To all whom it may concern:

Be it known that I, Gnonon BERRY, of Colne Mead, West Drayton, in the county of Middlesex, England, have invented certain new and useful Improvements in Alternating Current Distributing Systems, of which the following is a full, clear, and exact description.

- that :advantages in the construction and operationv of the apparatus employed are 013-? tained, including a reduction in the total capacity of the apparatus over that heretofore required and a reduction of the op erating losses To accomplish this object in a single phase system I preferably employ a plurality of main transformers and a supplementary transformer. The primary winding of a main transformer is connected in series with the primary winding of the supplementary transformer, and these series connected windings together are connected in parallel with the primary winding of another main transformer across the primary supply conductors. The secondary windings of the corresponding transformer are similarly connected across the secondary conductors of the distributing system. As the load varies through a predetermined value the supplementary transformer is inserted into and removed from the circuit by a relay which may be quite similar in structure and connections to that shown in the above mentioned U. S. Letters Patent. The switch mechanism and relay and the various transformers, as will be obvious, may be located respectively in any suitable place, each without respect to the other apparatus.

For a better understanding of my invention reference may be had to the accompanying drawing which illustrates diagrammatically a set of connections for a single phase system involving my invention, for, although my invention is not limited in its applicability to single phase systems, this application is one of the simplest.

Two main transformers AB, and a sup- Specification of Letters Patent.

Patented June 23, 1914.

Serial No. 458,194.

plementary transformer C are employed. The primary winding 0 of the supplementary transformer C, is connected in series with the primary winding (1 of the main transformer A, and these windings are collectively connected in parallel with the primary winding b of the main transformer B, across the primary supply conductors d e. The corresponding secondary windings a, c and b, of the transformers are similarly connected in series-parallel across the secondary supply conductors f g. 1

- h is the relay winding connected in series with the primary conductor d between the transformers and the source of energy and is adapted to effect'thr'ough' the double acting electro-magnetiedevice n, simultaneous operation of the movable switch contacts 11 j pertaining to the stationary contacts is m, and sh ort-circuit the primary and secondary windings c, c of the supplementary transformer C, or open the shunt about these windings to insert them into their respective circuits. This is accomplished in the manner described in the specification of the U. S. Patent No. 800,538, referred to above. As long as the load is-sufiiciently low to warrant the use of the supplementary transformer C, the parts will remain in the position shown, whereas when the load rises to a point at which it is necessary to cut the supplementary transformer out of circuit, the relay It will act through the electro magnetic device n to close the switches constituted by the elements 71 and contacts 70 m. Then the circuit is completed between the primary conductors through the winding 6 of the transformer B and in parallel to it from the line 6 through the winding a of transformer A, and through the shunt about the winding 0 and the contacts In and i to the conductor (1; likewise the secondary circuit is then completed through winding b and in parallel to it through the winding a and the shunt about the winding 0 including the contacts at and j.

By the means described, the relay h emsmall, say of about one kilowatt capacity for use with main transformers of large capacity, for example, of about one hundred kilowatts, as the relay is in no way dependent upon it for operation, and the total capacity of the main transformer need be but sufiicient to carry the maximum load. One relay only will be necessary for the several main and supplementary transformers, and the operating voltage will be maintained approximately constant in the substation.

While the above arrangement has been described for use in connection with two main transformers and a single supplementary transformer it will be obvious that any-suitable number of main and supplementary transformers may be used and the arrangement modified to meet the requirements;of various distributing systems all falling ;within the scope of my invention.

1. In an alternating current distributing system a' plurality-of main transformers, a supplementary transformer,;one main transformer having its primary winding connected in parallel with the series connection of the primary winding of a second main transformer and the primary winding of the. supplementary transformer across the primary supply conductors, the secondary windings of said transformers being similarlyv connected across thesecondary conductors of the distributingsystem, and a switch mechanism whereby the 1 supplementary transformer may be placed in circuit or re I moved from the circuit independently f'the connections to the main transformers substantially as described.

2. In an alternating current distributing system, aplurality of main transformers, a supplementary transformer, one main transformer having its primary winding connected in parallel With the series connection of the primary winding of a second main transformer and the primary winding of the supplementary transformer across the primary supply conductors, the secondary windings of said transformers being similarly connected across the secondary v conductors of the distributing system, and a switch mechanism comprising a relay and means controlled thereby for removing the supplementary transformer from the circuit or placing it in circuit as the load on the system rises above or falls below a predetermined amount substantially as described.

3. In an alternating current distributing system,a pluralityof main transformers, a supplementary transformer, one main transformer having its primary winding connected'in parallel with the series connection of Copies of this patent may beobtained for automatically removing the-supplementary transformerfrom the circuit or placingiit in circuit, substantially as describ 4. In an alternating current distributingv system in combination, aplurality: of'main transformers, a supplementary transformer,

a maintransformer having its primary winding connected in parallel with the series connection of the primary winding of a second :main transformer and the primary winding of .the: supplementaryv transformer across therprimary" supply I conductors, thesecondary windings ofwz-said transformers; being similarly connected across the' secondary supply conductors ofnthe distributing system, :a relay arranged in series with one of the supply conductors in'such a manner,

that the relay iscontrolled -by current-passing to or=from all the transformers and means controlled thereby whereby the-system can be altered from a condition in which the energy is being converted by: all the main transformers in parallel with the supplementary transformer in series with one of the main transformers to a conditionlin which all the main transformers are connected in .parallel Without th'ejsupplementary transformer and vice versa substantially as described. 2 7

5. In an alternating current distributing system, a plurality of main transformers, a supplementary. transformer, one main transformer having ,its primary winlding connected in parallel with the series connection of the primary winding of a second main transformer and the primary winding of the supplementary transformer across the primary supply conductors, the secondary windings of said transformers being similarly connected across the secondary supply conductors of the system,arelay arranged in series with a supply conductor and means controlled thereby for automatically cutting the supplementary transformer out of circuit substantially as described.

In witness whereof I have hereunto set my hand in the presence of'two witnesses.

GEORGE BERRY.

Witnesses:

H. D. JAMEsoN, F. L. RAND.

Washington, D. G. 

